Ammonium metatungstate [(NH4)6(H2W12O40)]•nH2O, English is Ammonium Metatungstatet, referred to as AMT, the CAS number of ammonium metatungstate is 23-65-4. Ammonium metatungstate is characterized by high solubility in water, and the solubility can reach 300g/100gH2O at 20°C, so it may be used to prepare high-concentration tungstate solutions without alkali metal ions. In industry, metatungstic acid is mainly used to treat the substrate of the production catalyst (such as alumina pellets), and can also be used as a corrosion inhibitor for nuclear shielding. Ammonium metatungstate can also be used to prepare precursors of other tungsten compounds .
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